nelson



O. T. NELSON.

BOILER.

APPLICATION FILED JUNE 9. WM.

1 19, 1. Patented Aug. "29, 1916.

' median.

OLLIE T. NELSQN, 01F SEATTLE, WASHINGTON.

BOHJEE.

Specification of Letters Patent. Patented flung. 29, rate.

Application filed Iunefl, 191d. Serial No. ,985.

This invention relates to boilers, and more especially to those of thehorizontal tubular type, in which baffles are used to deflect or guidethe heat in the desired direction.

The principal object of my present 1nvention is to improve theconstruction shown and described in my application for patent seriallynumbered 7 54136 filed January 30,

1913, in that the battle in my present construction is an integral partof the boiler shell itself and is thereby kept at a low tem* perature byhaving water against its inner surface at all times, thus preventingexcessive heating which would cause more rapid deterioration of thebattle, and therefore require more frequent renewals of the same thanwould otherwise be necessary. I attain these objects as will be morefully hereinafter described and explained, illustrated in theaccompanying drawings and pointed out in the appended claim.

In the drawings, Figure l'is a side elevationgof a boiler setting withpart of the boiler-and bafile in section. Fig. 2 is a rear and elevationof the boiler, showing the baffle. I

Referring now more particularly to the drawings, reference numeral 1designates the boiler shell, to the ends 'of which the tubes 2 aresecured. I

I 3 designates the boiler setting; 4, the grates; 5, the smoke pipe; 6,the combustion chamber; 6, the door of the said chamber, which may havea, finger piece 6*. The baffle is formed by ofisetting the rear endofthe boiler, as plainly shown in the drawings, and facing-the undermostpart of the ofiset portion with a plate 7 which forms the baffle proper.This plate 7 is here shown as welded or otherwise securel joined at 7,but it is obvious that such we ding could be dispensed with.

The burning gases from-the fires upon the grates 4, passing backwardlyand upwardly in the direction of the arrows .in Fig. 1, through thecombustion chamber 6, strike the bafie plate "7 which deflects the saidgases through the tubes 2 which lie belowthe horizontal plane of thebafie plate .7. The burning gases pass through those of the said tubes 2which lie beneath the horizontal plane of the bafile 7 to the forwardend of the boiler and return through the tubes 2 which lie above thesaid plane, and thence out through the smoke pipe 5. It will be readilyunderstood that the burning gases striking the bafie plate 7 would iuickly burn out the said bafie plate except or the presence of the wateragainst the inner surface of the said baffle plate. The water of courseabsorbs and dissipates the heat fromthe bafiie plate, thus preventingoverheating. I I I I As stated, the bailie plate 7 is integral with theboiler shell itself, being welded,

into one with the -rear endof the boiler, and

therefore involvesless handling of the parts in the setting u of theboiler, and ingeneral repairs to te same.

Structural changes i regard to the exact position and general contour ofthebathe plate, etc., will readily suggest themselves to others skilledin the art without departing from the spirit and scope of the invention,and ll therefore desire to avoid being limited to the exact constructionherein shown and described except as limited by the appended claim.

' Having described my invention, what I claim as new and desire toprotect by Letters Patent isv The combination with a cylindricalhorizontal fire tube boiler; having upper and lower semi-circular andtubed rear endmembers, of a solid water cooled metallic bae formed by asingle semi-circular offset along a diametrical plane between saidsemicircular end members at the rear end of the said boiler proper,whereby a space is left between the lower half of the rear end' of saidboiler and a boiler setting upon which the upper half of said rear endrests, for the urpose of allowing a free gas passage to t e tubes ofsaid boiler below the said bafie and at the same time cuttin passage tothe tubes above the sai bafie- ()LLTE T. NELSUN.

Witnesses:

Fuse P. GORIN, EMMA Kansas.

